1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 15 * Place - Suite 330, Boston, MA 02111-1307 USA. 16 * 17 * Authors: 18 * Haiyang Zhang <haiyangz@microsoft.com> 19 * Hank Janssen <hjanssen@microsoft.com> 20 */ 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 22 23 #include <linux/kernel.h> 24 #include <linux/sched.h> 25 #include <linux/wait.h> 26 #include <linux/mm.h> 27 #include <linux/delay.h> 28 #include <linux/io.h> 29 #include <linux/slab.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_ether.h> 32 33 #include "hyperv_net.h" 34 35 36 static struct netvsc_device *alloc_net_device(struct hv_device *device) 37 { 38 struct netvsc_device *net_device; 39 struct net_device *ndev = hv_get_drvdata(device); 40 41 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); 42 if (!net_device) 43 return NULL; 44 45 net_device->start_remove = false; 46 net_device->destroy = false; 47 net_device->dev = device; 48 net_device->ndev = ndev; 49 50 hv_set_drvdata(device, net_device); 51 return net_device; 52 } 53 54 static struct netvsc_device *get_outbound_net_device(struct hv_device *device) 55 { 56 struct netvsc_device *net_device; 57 58 net_device = hv_get_drvdata(device); 59 if (net_device && net_device->destroy) 60 net_device = NULL; 61 62 return net_device; 63 } 64 65 static struct netvsc_device *get_inbound_net_device(struct hv_device *device) 66 { 67 struct netvsc_device *net_device; 68 69 net_device = hv_get_drvdata(device); 70 71 if (!net_device) 72 goto get_in_err; 73 74 if (net_device->destroy && 75 atomic_read(&net_device->num_outstanding_sends) == 0) 76 net_device = NULL; 77 78 get_in_err: 79 return net_device; 80 } 81 82 83 static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) 84 { 85 struct nvsp_message *revoke_packet; 86 int ret = 0; 87 struct net_device *ndev = net_device->ndev; 88 89 /* 90 * If we got a section count, it means we received a 91 * SendReceiveBufferComplete msg (ie sent 92 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need 93 * to send a revoke msg here 94 */ 95 if (net_device->recv_section_cnt) { 96 /* Send the revoke receive buffer */ 97 revoke_packet = &net_device->revoke_packet; 98 memset(revoke_packet, 0, sizeof(struct nvsp_message)); 99 100 revoke_packet->hdr.msg_type = 101 NVSP_MSG1_TYPE_REVOKE_RECV_BUF; 102 revoke_packet->msg.v1_msg. 103 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 104 105 ret = vmbus_sendpacket(net_device->dev->channel, 106 revoke_packet, 107 sizeof(struct nvsp_message), 108 (unsigned long)revoke_packet, 109 VM_PKT_DATA_INBAND, 0); 110 /* 111 * If we failed here, we might as well return and 112 * have a leak rather than continue and a bugchk 113 */ 114 if (ret != 0) { 115 netdev_err(ndev, "unable to send " 116 "revoke receive buffer to netvsp\n"); 117 return ret; 118 } 119 } 120 121 /* Teardown the gpadl on the vsp end */ 122 if (net_device->recv_buf_gpadl_handle) { 123 ret = vmbus_teardown_gpadl(net_device->dev->channel, 124 net_device->recv_buf_gpadl_handle); 125 126 /* If we failed here, we might as well return and have a leak 127 * rather than continue and a bugchk 128 */ 129 if (ret != 0) { 130 netdev_err(ndev, 131 "unable to teardown receive buffer's gpadl\n"); 132 return ret; 133 } 134 net_device->recv_buf_gpadl_handle = 0; 135 } 136 137 if (net_device->recv_buf) { 138 /* Free up the receive buffer */ 139 free_pages((unsigned long)net_device->recv_buf, 140 get_order(net_device->recv_buf_size)); 141 net_device->recv_buf = NULL; 142 } 143 144 if (net_device->recv_section) { 145 net_device->recv_section_cnt = 0; 146 kfree(net_device->recv_section); 147 net_device->recv_section = NULL; 148 } 149 150 return ret; 151 } 152 153 static int netvsc_init_recv_buf(struct hv_device *device) 154 { 155 int ret = 0; 156 int t; 157 struct netvsc_device *net_device; 158 struct nvsp_message *init_packet; 159 struct net_device *ndev; 160 161 net_device = get_outbound_net_device(device); 162 if (!net_device) 163 return -ENODEV; 164 ndev = net_device->ndev; 165 166 net_device->recv_buf = 167 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 168 get_order(net_device->recv_buf_size)); 169 if (!net_device->recv_buf) { 170 netdev_err(ndev, "unable to allocate receive " 171 "buffer of size %d\n", net_device->recv_buf_size); 172 ret = -ENOMEM; 173 goto cleanup; 174 } 175 176 /* 177 * Establish the gpadl handle for this buffer on this 178 * channel. Note: This call uses the vmbus connection rather 179 * than the channel to establish the gpadl handle. 180 */ 181 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, 182 net_device->recv_buf_size, 183 &net_device->recv_buf_gpadl_handle); 184 if (ret != 0) { 185 netdev_err(ndev, 186 "unable to establish receive buffer's gpadl\n"); 187 goto cleanup; 188 } 189 190 191 /* Notify the NetVsp of the gpadl handle */ 192 init_packet = &net_device->channel_init_pkt; 193 194 memset(init_packet, 0, sizeof(struct nvsp_message)); 195 196 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; 197 init_packet->msg.v1_msg.send_recv_buf. 198 gpadl_handle = net_device->recv_buf_gpadl_handle; 199 init_packet->msg.v1_msg. 200 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; 201 202 /* Send the gpadl notification request */ 203 ret = vmbus_sendpacket(device->channel, init_packet, 204 sizeof(struct nvsp_message), 205 (unsigned long)init_packet, 206 VM_PKT_DATA_INBAND, 207 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 208 if (ret != 0) { 209 netdev_err(ndev, 210 "unable to send receive buffer's gpadl to netvsp\n"); 211 goto cleanup; 212 } 213 214 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 215 BUG_ON(t == 0); 216 217 218 /* Check the response */ 219 if (init_packet->msg.v1_msg. 220 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { 221 netdev_err(ndev, "Unable to complete receive buffer " 222 "initialization with NetVsp - status %d\n", 223 init_packet->msg.v1_msg. 224 send_recv_buf_complete.status); 225 ret = -EINVAL; 226 goto cleanup; 227 } 228 229 /* Parse the response */ 230 231 net_device->recv_section_cnt = init_packet->msg. 232 v1_msg.send_recv_buf_complete.num_sections; 233 234 net_device->recv_section = kmemdup( 235 init_packet->msg.v1_msg.send_recv_buf_complete.sections, 236 net_device->recv_section_cnt * 237 sizeof(struct nvsp_1_receive_buffer_section), 238 GFP_KERNEL); 239 if (net_device->recv_section == NULL) { 240 ret = -EINVAL; 241 goto cleanup; 242 } 243 244 /* 245 * For 1st release, there should only be 1 section that represents the 246 * entire receive buffer 247 */ 248 if (net_device->recv_section_cnt != 1 || 249 net_device->recv_section->offset != 0) { 250 ret = -EINVAL; 251 goto cleanup; 252 } 253 254 goto exit; 255 256 cleanup: 257 netvsc_destroy_recv_buf(net_device); 258 259 exit: 260 return ret; 261 } 262 263 264 /* Negotiate NVSP protocol version */ 265 static int negotiate_nvsp_ver(struct hv_device *device, 266 struct netvsc_device *net_device, 267 struct nvsp_message *init_packet, 268 u32 nvsp_ver) 269 { 270 int ret, t; 271 272 memset(init_packet, 0, sizeof(struct nvsp_message)); 273 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; 274 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; 275 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; 276 277 /* Send the init request */ 278 ret = vmbus_sendpacket(device->channel, init_packet, 279 sizeof(struct nvsp_message), 280 (unsigned long)init_packet, 281 VM_PKT_DATA_INBAND, 282 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 283 284 if (ret != 0) 285 return ret; 286 287 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); 288 289 if (t == 0) 290 return -ETIMEDOUT; 291 292 if (init_packet->msg.init_msg.init_complete.status != 293 NVSP_STAT_SUCCESS) 294 return -EINVAL; 295 296 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2) 297 return 0; 298 299 /* NVSPv2 only: Send NDIS config */ 300 memset(init_packet, 0, sizeof(struct nvsp_message)); 301 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; 302 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; 303 304 ret = vmbus_sendpacket(device->channel, init_packet, 305 sizeof(struct nvsp_message), 306 (unsigned long)init_packet, 307 VM_PKT_DATA_INBAND, 0); 308 309 return ret; 310 } 311 312 static int netvsc_connect_vsp(struct hv_device *device) 313 { 314 int ret; 315 struct netvsc_device *net_device; 316 struct nvsp_message *init_packet; 317 int ndis_version; 318 struct net_device *ndev; 319 320 net_device = get_outbound_net_device(device); 321 if (!net_device) 322 return -ENODEV; 323 ndev = net_device->ndev; 324 325 init_packet = &net_device->channel_init_pkt; 326 327 /* Negotiate the latest NVSP protocol supported */ 328 if (negotiate_nvsp_ver(device, net_device, init_packet, 329 NVSP_PROTOCOL_VERSION_2) == 0) { 330 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2; 331 } else if (negotiate_nvsp_ver(device, net_device, init_packet, 332 NVSP_PROTOCOL_VERSION_1) == 0) { 333 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1; 334 } else { 335 ret = -EPROTO; 336 goto cleanup; 337 } 338 339 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); 340 341 /* Send the ndis version */ 342 memset(init_packet, 0, sizeof(struct nvsp_message)); 343 344 ndis_version = 0x00050000; 345 346 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; 347 init_packet->msg.v1_msg. 348 send_ndis_ver.ndis_major_ver = 349 (ndis_version & 0xFFFF0000) >> 16; 350 init_packet->msg.v1_msg. 351 send_ndis_ver.ndis_minor_ver = 352 ndis_version & 0xFFFF; 353 354 /* Send the init request */ 355 ret = vmbus_sendpacket(device->channel, init_packet, 356 sizeof(struct nvsp_message), 357 (unsigned long)init_packet, 358 VM_PKT_DATA_INBAND, 0); 359 if (ret != 0) 360 goto cleanup; 361 362 /* Post the big receive buffer to NetVSP */ 363 ret = netvsc_init_recv_buf(device); 364 365 cleanup: 366 return ret; 367 } 368 369 static void netvsc_disconnect_vsp(struct netvsc_device *net_device) 370 { 371 netvsc_destroy_recv_buf(net_device); 372 } 373 374 /* 375 * netvsc_device_remove - Callback when the root bus device is removed 376 */ 377 int netvsc_device_remove(struct hv_device *device) 378 { 379 struct netvsc_device *net_device; 380 struct hv_netvsc_packet *netvsc_packet, *pos; 381 unsigned long flags; 382 383 net_device = hv_get_drvdata(device); 384 spin_lock_irqsave(&device->channel->inbound_lock, flags); 385 net_device->destroy = true; 386 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 387 388 /* Wait for all send completions */ 389 while (atomic_read(&net_device->num_outstanding_sends)) { 390 dev_info(&device->device, 391 "waiting for %d requests to complete...\n", 392 atomic_read(&net_device->num_outstanding_sends)); 393 udelay(100); 394 } 395 396 netvsc_disconnect_vsp(net_device); 397 398 /* 399 * Since we have already drained, we don't need to busy wait 400 * as was done in final_release_stor_device() 401 * Note that we cannot set the ext pointer to NULL until 402 * we have drained - to drain the outgoing packets, we need to 403 * allow incoming packets. 404 */ 405 406 spin_lock_irqsave(&device->channel->inbound_lock, flags); 407 hv_set_drvdata(device, NULL); 408 spin_unlock_irqrestore(&device->channel->inbound_lock, flags); 409 410 /* 411 * At this point, no one should be accessing net_device 412 * except in here 413 */ 414 dev_notice(&device->device, "net device safe to remove\n"); 415 416 /* Now, we can close the channel safely */ 417 vmbus_close(device->channel); 418 419 /* Release all resources */ 420 list_for_each_entry_safe(netvsc_packet, pos, 421 &net_device->recv_pkt_list, list_ent) { 422 list_del(&netvsc_packet->list_ent); 423 kfree(netvsc_packet); 424 } 425 426 kfree(net_device); 427 return 0; 428 } 429 430 static void netvsc_send_completion(struct hv_device *device, 431 struct vmpacket_descriptor *packet) 432 { 433 struct netvsc_device *net_device; 434 struct nvsp_message *nvsp_packet; 435 struct hv_netvsc_packet *nvsc_packet; 436 struct net_device *ndev; 437 438 net_device = get_inbound_net_device(device); 439 if (!net_device) 440 return; 441 ndev = net_device->ndev; 442 443 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 444 (packet->offset8 << 3)); 445 446 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || 447 (nvsp_packet->hdr.msg_type == 448 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || 449 (nvsp_packet->hdr.msg_type == 450 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { 451 /* Copy the response back */ 452 memcpy(&net_device->channel_init_pkt, nvsp_packet, 453 sizeof(struct nvsp_message)); 454 complete(&net_device->channel_init_wait); 455 } else if (nvsp_packet->hdr.msg_type == 456 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { 457 /* Get the send context */ 458 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) 459 packet->trans_id; 460 461 /* Notify the layer above us */ 462 nvsc_packet->completion.send.send_completion( 463 nvsc_packet->completion.send.send_completion_ctx); 464 465 atomic_dec(&net_device->num_outstanding_sends); 466 467 if (netif_queue_stopped(ndev) && !net_device->start_remove) 468 netif_wake_queue(ndev); 469 } else { 470 netdev_err(ndev, "Unknown send completion packet type- " 471 "%d received!!\n", nvsp_packet->hdr.msg_type); 472 } 473 474 } 475 476 int netvsc_send(struct hv_device *device, 477 struct hv_netvsc_packet *packet) 478 { 479 struct netvsc_device *net_device; 480 int ret = 0; 481 struct nvsp_message sendMessage; 482 struct net_device *ndev; 483 484 net_device = get_outbound_net_device(device); 485 if (!net_device) 486 return -ENODEV; 487 ndev = net_device->ndev; 488 489 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; 490 if (packet->is_data_pkt) { 491 /* 0 is RMC_DATA; */ 492 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; 493 } else { 494 /* 1 is RMC_CONTROL; */ 495 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; 496 } 497 498 /* Not using send buffer section */ 499 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = 500 0xFFFFFFFF; 501 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; 502 503 if (packet->page_buf_cnt) { 504 ret = vmbus_sendpacket_pagebuffer(device->channel, 505 packet->page_buf, 506 packet->page_buf_cnt, 507 &sendMessage, 508 sizeof(struct nvsp_message), 509 (unsigned long)packet); 510 } else { 511 ret = vmbus_sendpacket(device->channel, &sendMessage, 512 sizeof(struct nvsp_message), 513 (unsigned long)packet, 514 VM_PKT_DATA_INBAND, 515 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); 516 517 } 518 519 if (ret == 0) { 520 atomic_inc(&net_device->num_outstanding_sends); 521 } else if (ret == -EAGAIN) { 522 netif_stop_queue(ndev); 523 if (atomic_read(&net_device->num_outstanding_sends) < 1) 524 netif_wake_queue(ndev); 525 } else { 526 netdev_err(ndev, "Unable to send packet %p ret %d\n", 527 packet, ret); 528 } 529 530 return ret; 531 } 532 533 static void netvsc_send_recv_completion(struct hv_device *device, 534 u64 transaction_id) 535 { 536 struct nvsp_message recvcompMessage; 537 int retries = 0; 538 int ret; 539 struct net_device *ndev; 540 struct netvsc_device *net_device = hv_get_drvdata(device); 541 542 ndev = net_device->ndev; 543 544 recvcompMessage.hdr.msg_type = 545 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; 546 547 /* FIXME: Pass in the status */ 548 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = 549 NVSP_STAT_SUCCESS; 550 551 retry_send_cmplt: 552 /* Send the completion */ 553 ret = vmbus_sendpacket(device->channel, &recvcompMessage, 554 sizeof(struct nvsp_message), transaction_id, 555 VM_PKT_COMP, 0); 556 if (ret == 0) { 557 /* success */ 558 /* no-op */ 559 } else if (ret == -EAGAIN) { 560 /* no more room...wait a bit and attempt to retry 3 times */ 561 retries++; 562 netdev_err(ndev, "unable to send receive completion pkt" 563 " (tid %llx)...retrying %d\n", transaction_id, retries); 564 565 if (retries < 4) { 566 udelay(100); 567 goto retry_send_cmplt; 568 } else { 569 netdev_err(ndev, "unable to send receive " 570 "completion pkt (tid %llx)...give up retrying\n", 571 transaction_id); 572 } 573 } else { 574 netdev_err(ndev, "unable to send receive " 575 "completion pkt - %llx\n", transaction_id); 576 } 577 } 578 579 /* Send a receive completion packet to RNDIS device (ie NetVsp) */ 580 static void netvsc_receive_completion(void *context) 581 { 582 struct hv_netvsc_packet *packet = context; 583 struct hv_device *device = (struct hv_device *)packet->device; 584 struct netvsc_device *net_device; 585 u64 transaction_id = 0; 586 bool fsend_receive_comp = false; 587 unsigned long flags; 588 struct net_device *ndev; 589 590 /* 591 * Even though it seems logical to do a GetOutboundNetDevice() here to 592 * send out receive completion, we are using GetInboundNetDevice() 593 * since we may have disable outbound traffic already. 594 */ 595 net_device = get_inbound_net_device(device); 596 if (!net_device) 597 return; 598 ndev = net_device->ndev; 599 600 /* Overloading use of the lock. */ 601 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 602 603 packet->xfer_page_pkt->count--; 604 605 /* 606 * Last one in the line that represent 1 xfer page packet. 607 * Return the xfer page packet itself to the freelist 608 */ 609 if (packet->xfer_page_pkt->count == 0) { 610 fsend_receive_comp = true; 611 transaction_id = packet->completion.recv.recv_completion_tid; 612 list_add_tail(&packet->xfer_page_pkt->list_ent, 613 &net_device->recv_pkt_list); 614 615 } 616 617 /* Put the packet back */ 618 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); 619 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 620 621 /* Send a receive completion for the xfer page packet */ 622 if (fsend_receive_comp) 623 netvsc_send_recv_completion(device, transaction_id); 624 625 } 626 627 static void netvsc_receive(struct hv_device *device, 628 struct vmpacket_descriptor *packet) 629 { 630 struct netvsc_device *net_device; 631 struct vmtransfer_page_packet_header *vmxferpage_packet; 632 struct nvsp_message *nvsp_packet; 633 struct hv_netvsc_packet *netvsc_packet = NULL; 634 /* struct netvsc_driver *netvscDriver; */ 635 struct xferpage_packet *xferpage_packet = NULL; 636 int i; 637 int count = 0; 638 unsigned long flags; 639 struct net_device *ndev; 640 641 LIST_HEAD(listHead); 642 643 net_device = get_inbound_net_device(device); 644 if (!net_device) 645 return; 646 ndev = net_device->ndev; 647 648 /* 649 * All inbound packets other than send completion should be xfer page 650 * packet 651 */ 652 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { 653 netdev_err(ndev, "Unknown packet type received - %d\n", 654 packet->type); 655 return; 656 } 657 658 nvsp_packet = (struct nvsp_message *)((unsigned long)packet + 659 (packet->offset8 << 3)); 660 661 /* Make sure this is a valid nvsp packet */ 662 if (nvsp_packet->hdr.msg_type != 663 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { 664 netdev_err(ndev, "Unknown nvsp packet type received-" 665 " %d\n", nvsp_packet->hdr.msg_type); 666 return; 667 } 668 669 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; 670 671 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { 672 netdev_err(ndev, "Invalid xfer page set id - " 673 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, 674 vmxferpage_packet->xfer_pageset_id); 675 return; 676 } 677 678 /* 679 * Grab free packets (range count + 1) to represent this xfer 680 * page packet. +1 to represent the xfer page packet itself. 681 * We grab it here so that we know exactly how many we can 682 * fulfil 683 */ 684 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 685 while (!list_empty(&net_device->recv_pkt_list)) { 686 list_move_tail(net_device->recv_pkt_list.next, &listHead); 687 if (++count == vmxferpage_packet->range_cnt + 1) 688 break; 689 } 690 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); 691 692 /* 693 * We need at least 2 netvsc pkts (1 to represent the xfer 694 * page and at least 1 for the range) i.e. we can handled 695 * some of the xfer page packet ranges... 696 */ 697 if (count < 2) { 698 netdev_err(ndev, "Got only %d netvsc pkt...needed " 699 "%d pkts. Dropping this xfer page packet completely!\n", 700 count, vmxferpage_packet->range_cnt + 1); 701 702 /* Return it to the freelist */ 703 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); 704 for (i = count; i != 0; i--) { 705 list_move_tail(listHead.next, 706 &net_device->recv_pkt_list); 707 } 708 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, 709 flags); 710 711 netvsc_send_recv_completion(device, 712 vmxferpage_packet->d.trans_id); 713 714 return; 715 } 716 717 /* Remove the 1st packet to represent the xfer page packet itself */ 718 xferpage_packet = (struct xferpage_packet *)listHead.next; 719 list_del(&xferpage_packet->list_ent); 720 721 /* This is how much we can satisfy */ 722 xferpage_packet->count = count - 1; 723 724 if (xferpage_packet->count != vmxferpage_packet->range_cnt) { 725 netdev_err(ndev, "Needed %d netvsc pkts to satisfy " 726 "this xfer page...got %d\n", 727 vmxferpage_packet->range_cnt, xferpage_packet->count); 728 } 729 730 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ 731 for (i = 0; i < (count - 1); i++) { 732 netvsc_packet = (struct hv_netvsc_packet *)listHead.next; 733 list_del(&netvsc_packet->list_ent); 734 735 /* Initialize the netvsc packet */ 736 netvsc_packet->xfer_page_pkt = xferpage_packet; 737 netvsc_packet->completion.recv.recv_completion = 738 netvsc_receive_completion; 739 netvsc_packet->completion.recv.recv_completion_ctx = 740 netvsc_packet; 741 netvsc_packet->device = device; 742 /* Save this so that we can send it back */ 743 netvsc_packet->completion.recv.recv_completion_tid = 744 vmxferpage_packet->d.trans_id; 745 746 netvsc_packet->data = (void *)((unsigned long)net_device-> 747 recv_buf + vmxferpage_packet->ranges[i].byte_offset); 748 netvsc_packet->total_data_buflen = 749 vmxferpage_packet->ranges[i].byte_count; 750 751 /* Pass it to the upper layer */ 752 rndis_filter_receive(device, netvsc_packet); 753 754 netvsc_receive_completion(netvsc_packet-> 755 completion.recv.recv_completion_ctx); 756 } 757 758 } 759 760 static void netvsc_channel_cb(void *context) 761 { 762 int ret; 763 struct hv_device *device = context; 764 struct netvsc_device *net_device; 765 u32 bytes_recvd; 766 u64 request_id; 767 unsigned char *packet; 768 struct vmpacket_descriptor *desc; 769 unsigned char *buffer; 770 int bufferlen = NETVSC_PACKET_SIZE; 771 struct net_device *ndev; 772 773 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), 774 GFP_ATOMIC); 775 if (!packet) 776 return; 777 buffer = packet; 778 779 net_device = get_inbound_net_device(device); 780 if (!net_device) 781 goto out; 782 ndev = net_device->ndev; 783 784 do { 785 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, 786 &bytes_recvd, &request_id); 787 if (ret == 0) { 788 if (bytes_recvd > 0) { 789 desc = (struct vmpacket_descriptor *)buffer; 790 switch (desc->type) { 791 case VM_PKT_COMP: 792 netvsc_send_completion(device, desc); 793 break; 794 795 case VM_PKT_DATA_USING_XFER_PAGES: 796 netvsc_receive(device, desc); 797 break; 798 799 default: 800 netdev_err(ndev, 801 "unhandled packet type %d, " 802 "tid %llx len %d\n", 803 desc->type, request_id, 804 bytes_recvd); 805 break; 806 } 807 808 /* reset */ 809 if (bufferlen > NETVSC_PACKET_SIZE) { 810 kfree(buffer); 811 buffer = packet; 812 bufferlen = NETVSC_PACKET_SIZE; 813 } 814 } else { 815 /* reset */ 816 if (bufferlen > NETVSC_PACKET_SIZE) { 817 kfree(buffer); 818 buffer = packet; 819 bufferlen = NETVSC_PACKET_SIZE; 820 } 821 822 break; 823 } 824 } else if (ret == -ENOBUFS) { 825 /* Handle large packet */ 826 buffer = kmalloc(bytes_recvd, GFP_ATOMIC); 827 if (buffer == NULL) { 828 /* Try again next time around */ 829 netdev_err(ndev, 830 "unable to allocate buffer of size " 831 "(%d)!!\n", bytes_recvd); 832 break; 833 } 834 835 bufferlen = bytes_recvd; 836 } 837 } while (1); 838 839 out: 840 kfree(buffer); 841 return; 842 } 843 844 /* 845 * netvsc_device_add - Callback when the device belonging to this 846 * driver is added 847 */ 848 int netvsc_device_add(struct hv_device *device, void *additional_info) 849 { 850 int ret = 0; 851 int i; 852 int ring_size = 853 ((struct netvsc_device_info *)additional_info)->ring_size; 854 struct netvsc_device *net_device; 855 struct hv_netvsc_packet *packet, *pos; 856 struct net_device *ndev; 857 858 net_device = alloc_net_device(device); 859 if (!net_device) { 860 ret = -ENOMEM; 861 goto cleanup; 862 } 863 864 /* 865 * Coming into this function, struct net_device * is 866 * registered as the driver private data. 867 * In alloc_net_device(), we register struct netvsc_device * 868 * as the driver private data and stash away struct net_device * 869 * in struct netvsc_device *. 870 */ 871 ndev = net_device->ndev; 872 873 /* Initialize the NetVSC channel extension */ 874 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; 875 spin_lock_init(&net_device->recv_pkt_list_lock); 876 877 INIT_LIST_HEAD(&net_device->recv_pkt_list); 878 879 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { 880 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 881 (NETVSC_RECEIVE_SG_COUNT * 882 sizeof(struct hv_page_buffer)), GFP_KERNEL); 883 if (!packet) 884 break; 885 886 list_add_tail(&packet->list_ent, 887 &net_device->recv_pkt_list); 888 } 889 init_completion(&net_device->channel_init_wait); 890 891 /* Open the channel */ 892 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, 893 ring_size * PAGE_SIZE, NULL, 0, 894 netvsc_channel_cb, device); 895 896 if (ret != 0) { 897 netdev_err(ndev, "unable to open channel: %d\n", ret); 898 goto cleanup; 899 } 900 901 /* Channel is opened */ 902 pr_info("hv_netvsc channel opened successfully\n"); 903 904 /* Connect with the NetVsp */ 905 ret = netvsc_connect_vsp(device); 906 if (ret != 0) { 907 netdev_err(ndev, 908 "unable to connect to NetVSP - %d\n", ret); 909 goto close; 910 } 911 912 return ret; 913 914 close: 915 /* Now, we can close the channel safely */ 916 vmbus_close(device->channel); 917 918 cleanup: 919 920 if (net_device) { 921 list_for_each_entry_safe(packet, pos, 922 &net_device->recv_pkt_list, 923 list_ent) { 924 list_del(&packet->list_ent); 925 kfree(packet); 926 } 927 928 kfree(net_device); 929 } 930 931 return ret; 932 } 933